Leak or condensation?

Matthew Carbaugh
I am a contractor in Va and have recently installed a Englert 2500 mechanically fastened roof system. The roof is approximately 120 squares and is basically two buildings. One smaller with 15' panels over 2' spaced 8" wide wood purlings and the other larger roof is a 28' panel over 5' spaced 2" wide iron purlings. The roof is about a 7/12 pitch. After the roof was installed and it rained, it looked to as if the seams were seeping water. Considering we hand seamed it we went back over all the seams with a $9000 electric seamer straight from englert. It leaked just as bad in the next big rain. Now it's not the cap because it's an open roof and you can see everything. Both buildings are leaking with the larger worse. The building is being renovated. The insulation is poor (better in the smaller) and there's no ventilation to move the stale air. It's also winter so the air outside is much cooler than inside. We installed the roof to their engineered specs. My question is have you any more ideas on what it could be. I say I think it's condensation and they look at me as if I was crazy but there's no vapor barrier, the building is gutted, and there is no movement of air. Is it possible for condensation to seep out of the seams while it rains without dripping off the actual inside surface of the panel? Also it frosts just as much underneath the panel as it does on the outside. Thank you for your input.
Eric Novotny
An informed customer is the Best Customer!
Matt, Post up some pictures. Condensation is certainly a potential but you wont want to insulate prior to ruling out the leak potential.
Guest User
This is the only image I have, but the water is showing up on the seams on about every four panels, no higher than halfway up the panels. The roof is over 100 square.
Eric Novotny
An informed customer is the Best Customer!
Needs to be water tested but it would not be the first roof that showed condensation at the seams. The panels are usually a bit crowned in that direction so what we see as droplets is actually water running to the side. You will know shortly when we have some dry weather and you are still seeing water.
Dick Bus
on a 7/12 pitch seams do not leak, unless there is ponding created from an improper flashing of a penetration. But that is not the case here. This is definitely a condensation issue, Eric is correct in the 'crown' of the panel is causing the condensate to move to the side of the panel. There are two things that will prevent this. Ventilation and a vapor barrier. Is there a vented ridge cap and ventilation at the eave? I would try that first before attempting anything else.

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